MacBook Pro battery conditioning
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From: nospam on 30 Jan 2010 13:28 In article <1jd4srp.1hd9aeb122e96eN%pf(a)porkain'tkosher.oink>, Paul Fuchs <pf(a)porkain'tkosher.oink> wrote: > The refurb is less than a year old, and the battery should be covered if > its problem is defective workmanship. I would say that 40 cycles and no > bullet holes is pretty sure proof of that. if it's still under warranty, they should replace it for free. > I wonder if refurbs get new batteries? Maybe Apple just resets the old > ones to 0 cycles? Hmmm. some batteries fail prematurely. others last longer than expected. it happens.
From: Tom Stiller on 30 Jan 2010 15:25 In article <1jd4srp.1hd9aeb122e96eN%pf(a)porkain'tkosher.oink>, pf(a)porkain'tkosher.oink (Paul Fuchs) wrote: > nospam <nospam(a)nospam.invalid> wrote: > > > In article <1jd3nw7.1igramua3xb2xN%pf(a)porkain'tkosher.oink>, Paul > > Fuchs <pf(a)porkain'tkosher.oink> wrote: > > > > > > > My friend (he's in Holland) downloaded coconutbattery. It > > > > > reports that his battery is at 96% of orginal and has only > > > > > 40 cycles. Yet he is only getting an hour out of it. Any > > > > > ideas? > > > > > > > > does it suddenly shut down after an hour or so? > > > > > > Yes > > > > usually a failed cell in the battery pack, as i thought. the > > solution is replace the battery pack. > > > > > > does system profiler say service battery (snow leopard only i > > > > think)? > > > > > > He is running 10.6.2 but I'll ask about that. > > > > chances are it says service battery. sudden shutdown is a very > > clear symptom of a failed internal cell. > > > > > > it sounds like there may be a defective cell in the battery. > > > > > > If a cell where defective, would it register 96% of the original > > > on coco? > > > > sure. the cell can be charged, it just doesn't hold the charge for > > very long. that cell is first to discharge and then it might > > reverse charge from the other healthy cells. the output voltage of > > the battery pack drops, and if it drops below the minimum to run > > the computer, it suddenly shuts down with no warning. > > Makes sense to me. I could see the bad cell draining the other > cells, but, just out of curiosity, where would the energy be > dissipated? Heat, the final resting place of all dissipated energy. There are three laws of thermodynamics: 1. You can't win. 2. You can't break even 3. You can't get out of the game. > > The refurb is less than a year old, and the battery should be covered > if its problem is defective workmanship. I would say that 40 cycles > and no bullet holes is pretty sure proof of that. > > I wonder if refurbs get new batteries? Maybe Apple just resets the > old ones to 0 cycles? Hmmm. -- Tom Stiller PGP fingerprint = 5108 DDB2 9761 EDE5 E7E3 7BDA 71ED 6496 99C0 C7CF
From: Tom Harrington on 30 Jan 2010 17:44
In article <1jd4srp.1hd9aeb122e96eN%pf(a)porkain'tkosher.oink>, pf(a)porkain'tkosher.oink (Paul Fuchs) wrote: > The refurb is less than a year old, and the battery should be covered if > its problem is defective workmanship. I would say that 40 cycles and no > bullet holes is pretty sure proof of that. That's different-- in that case just take it straight back to Apple. -- Tom "Tom" Harrington Independent Mac OS X developer since 2002 http://www.atomicbird.com/ |